Leptodactylus knudseni
Silhouette: Jose Carlos Arenas-Monroy · PhyloPic
In 3 days ~20% in a week ~40%
Leptodactylus knudseni, known commonly as Knudsen's frog, is a species of frog in the family Leptodactylidae. It is found in the greater Amazon basin. The first description of the species was published by W. Ronald Heyer in 1972.
The specific name, knudseni, is in honor of Jens W. Knudsen, who Heyer called "the most important influence in my decision to become a professional biologist" and said "continues to encourage my research efforts." The holotype was a juvenile female, with Heyer stating that he found the frog so distinctive that he preferred to describe it immediately rather than waiting for an adult specimen. It was collected from a decaying log in August 1970 by Heyer and Keith A. Berven, at an elevation of 260 m (850 ft), in Napo, Ecuador.
Usual adult snout–vent lengths range between 94–170 mm (3.7–6.7 in) for males and 102.7–154 mm (4.04–6.06 in) for females. They have smooth bodies and wide heads, are orange-brown or greenish on top and have a white belly. They have triangular dark markings on their lips, light-colored lines above the lips, black lines from the nose going over each eye, markings between the eyes.The iris of... Wikipedia →
Recording0:14
French Guiana · 2024
© Arnaud Aury · XC952394 · CC BY-NC-SA 4.0
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Brazil · 1985
© M.S. Hoogmoed · XC882800 · CC BY 4.0
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Guyana · 2026
© Paul Prior · iNaturalist · CC BY 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Brownsberg Nature Park | 🇸🇷 Suriname | |
| 2 | Tambopata National Reserve | 🇵🇪 Peru | |
| 3 | Manu National Park | 🇵🇪 Peru |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Manaus | 🇧🇷 Brazil |
With luck
About 10% of wildlife watchers report a Knudsen's Thin-toed Frog sighting in Manu National Park on a given day, based on 5 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 61st most-seen of the 67 amphibians we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
January
In that month about 30% of wildlife watchers report a Knudsen's Thin-toed Frog in Manu National Park on a given day, against under 5% in February–June and August–December, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Knudsen's Thin-toed Frog sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
3rd of 3
Of the 3 parks where we can rate Knudsen's Thin-toed Frog sightings, Manu National Park ranks 3rd at about 10%. The best odds are in Brownsberg Nature Park (Suriname, about 50%) and Tambopata National Reserve (Peru, about 20%).
Same genus: Leptodactylus
The closest relatives of the Knudsen's Thin-toed Frog that you can see in Manu National Park (genus Leptodactylus, Neotropical Grass Frogs) are Peru white-lipped frog (about 30%), Madre de Dios Thin-toed Frog (about 30%) and Loreto White-lipped Frog (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Knudsen's Thin-toed Frog is recorded against all the amphibians logged in Manu National Park (5 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
